| File: | src/sbin/dhclient/parse.c |
| Warning: | line 93, column 6 Value stored to 'token' is never read |
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| 1 | /* $OpenBSD: parse.c,v 1.83 2019/07/22 17:20:06 krw Exp $ */ |
| 2 | |
| 3 | /* Common parser code for dhcpd and dhclient. */ |
| 4 | |
| 5 | /* |
| 6 | * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of The Internet Software Consortium nor the names |
| 19 | * of its contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND |
| 23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 26 | * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR |
| 27 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 29 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 30 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 31 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 32 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 33 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * This software has been written for the Internet Software Consortium |
| 37 | * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie |
| 38 | * Enterprises. To learn more about the Internet Software Consortium, |
| 39 | * see ``http://www.vix.com/isc''. To learn more about Vixie |
| 40 | * Enterprises, see ``http://www.vix.com''. |
| 41 | */ |
| 42 | |
| 43 | #include <sys/queue.h> |
| 44 | #include <sys/socket.h> |
| 45 | |
| 46 | #include <net/if.h> |
| 47 | |
| 48 | #include <netinet/in.h> |
| 49 | #include <netinet/if_ether.h> |
| 50 | |
| 51 | #include <errno(*__errno()).h> |
| 52 | #include <limits.h> |
| 53 | #include <signal.h> |
| 54 | #include <stdio.h> |
| 55 | #include <stdlib.h> |
| 56 | #include <stdint.h> |
| 57 | #include <string.h> |
| 58 | #include <syslog.h> |
| 59 | #include <unistd.h> |
| 60 | #include <vis.h> |
| 61 | |
| 62 | #include "dhcp.h" |
| 63 | #include "dhcpd.h" |
| 64 | #include "dhctoken.h" |
| 65 | #include "log.h" |
| 66 | |
| 67 | /* |
| 68 | * Skip to the semicolon ending the current statement. If we encounter |
| 69 | * braces, the matching closing brace terminates the statement. If we |
| 70 | * encounter a right brace but haven't encountered a left brace, return |
| 71 | * leaving the brace in the token buffer for the caller. If we see a |
| 72 | * semicolon and haven't seen a left brace, return. This lets us skip |
| 73 | * over: |
| 74 | * |
| 75 | * statement; |
| 76 | * statement foo bar { } |
| 77 | * statement foo bar { statement { } } |
| 78 | * statement} |
| 79 | * |
| 80 | * ...et cetera. |
| 81 | */ |
| 82 | void |
| 83 | skip_to_semi(FILE *cfile) |
| 84 | { |
| 85 | int token; |
| 86 | int brace_count = 0; |
| 87 | |
| 88 | do { |
| 89 | token = peek_token(NULL((void *)0), cfile); |
| 90 | if (token == '}') { |
| 91 | if (brace_count > 0) { |
| 92 | if (--brace_count == 0) { |
| 93 | token = next_token(NULL((void *)0), cfile); |
Value stored to 'token' is never read | |
| 94 | return; |
| 95 | } |
| 96 | } else |
| 97 | return; |
| 98 | } else if (token == '{') { |
| 99 | brace_count++; |
| 100 | } else if (token == ';' && brace_count == 0) { |
| 101 | token = next_token(NULL((void *)0), cfile); |
| 102 | return; |
| 103 | } |
| 104 | token = next_token(NULL((void *)0), cfile); |
| 105 | } while (token != EOF(-1)); |
| 106 | } |
| 107 | |
| 108 | int |
| 109 | parse_semi(FILE *cfile) |
| 110 | { |
| 111 | int token; |
| 112 | |
| 113 | token = next_token(NULL((void *)0), cfile); |
| 114 | if (token == ';') |
| 115 | return 1; |
| 116 | |
| 117 | parse_warn("expecting semicolon."); |
| 118 | skip_to_semi(cfile); |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | parse_string(FILE *cfile, char **string) |
| 125 | { |
| 126 | static char unvisbuf[1500]; |
| 127 | char *val; |
| 128 | int i, token; |
| 129 | |
| 130 | token = next_token(&val, cfile); |
| 131 | if (token == TOK_STRING262) { |
| 132 | i = strnunvis(unvisbuf, val, sizeof(unvisbuf)); |
| 133 | if (i >= 0) { |
| 134 | *string = strdup(unvisbuf); |
| 135 | if (*string == NULL((void *)0)) |
| 136 | fatal("strdup(unvisbuf)"); |
| 137 | return 1; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | parse_warn("expecting string."); |
| 142 | |
| 143 | if (token != ';') |
| 144 | skip_to_semi(cfile); |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * cidr :== ip-address "/" bit-count |
| 151 | * ip-address :== NUMBER [ DOT NUMBER [ DOT NUMBER [ DOT NUMBER ] ] ] |
| 152 | * bit-count :== 0..32 |
| 153 | */ |
| 154 | int |
| 155 | parse_cidr(FILE *cfile, unsigned char *cidr) |
| 156 | { |
| 157 | uint8_t buf[5]; |
| 158 | const char *errstr; |
| 159 | char *val; |
| 160 | long long numval; |
| 161 | unsigned int i; |
| 162 | int token; |
| 163 | |
| 164 | memset(buf, 0, sizeof(buf)); |
| 165 | i = 1; /* Last four octets hold subnet, first octet the # of bits. */ |
| 166 | do { |
| 167 | token = next_token(&val, cfile); |
| 168 | if (i == 0) |
| 169 | numval = strtonum(val, 0, 32, &errstr); |
| 170 | else |
| 171 | numval = strtonum(val, 0, UINT8_MAX0xff, &errstr); |
| 172 | if (errstr != NULL((void *)0)) |
| 173 | break; |
| 174 | buf[i++] = numval; |
| 175 | if (i == 1) { |
| 176 | memcpy(cidr, buf, sizeof(buf)); /* XXX Need cidr_t */ |
| 177 | return 1; |
| 178 | } |
| 179 | token = next_token(NULL((void *)0), cfile); |
| 180 | if (token == '/') |
| 181 | i = 0; |
| 182 | if (i == sizeof(buf)) |
| 183 | break; |
| 184 | } while (token == '.' || token == '/'); |
| 185 | |
| 186 | parse_warn("expecting IPv4 CIDR block."); |
| 187 | |
| 188 | if (token != ';') |
| 189 | skip_to_semi(cfile); |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | int |
| 195 | parse_ip_addr(FILE *cfile, struct in_addr *addr) |
| 196 | { |
| 197 | struct in_addr buf; |
| 198 | const char *errstr; |
| 199 | char *val; |
| 200 | long long numval; |
| 201 | unsigned int i; |
| 202 | int token; |
| 203 | |
| 204 | i = 0; |
| 205 | do { |
| 206 | token = next_token(&val, cfile); |
| 207 | numval = strtonum(val, 0, UINT8_MAX0xff, &errstr); |
| 208 | if (errstr != NULL((void *)0)) |
| 209 | break; |
| 210 | ((uint8_t *)&buf)[i++] = numval; |
| 211 | if (i == sizeof(buf)) { |
| 212 | memcpy(addr, &buf, sizeof(*addr)); |
| 213 | return 1; |
| 214 | } |
| 215 | token = next_token(NULL((void *)0), cfile); |
| 216 | } while (token == '.'); |
| 217 | |
| 218 | parse_warn("expecting IPv4 address."); |
| 219 | |
| 220 | if (token != ';') |
| 221 | skip_to_semi(cfile); |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | int |
| 227 | parse_boolean(FILE *cfile, unsigned char *buf) |
| 228 | { |
| 229 | char *val; |
| 230 | int token; |
| 231 | |
| 232 | token = next_token(&val, cfile); |
| 233 | if (is_identifier(token)((token) >= 257 && (token) != 262 && (token ) != 263 && (token) != (-1)) != 0) { |
| 234 | if (strcasecmp(val, "true") == 0 || |
| 235 | strcasecmp(val, "on") == 0) { |
| 236 | buf[0] = 1; |
| 237 | return 1; |
| 238 | } |
| 239 | if (strcasecmp(val, "false") == 0 || |
| 240 | strcasecmp(val, "off") == 0) { |
| 241 | buf[0] = 0; |
| 242 | return 1; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | parse_warn("expecting boolean."); |
| 247 | if (token != ';') |
| 248 | skip_to_semi(cfile); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | int |
| 254 | parse_number(FILE *cfile, long long *number, long long low, long long high) |
| 255 | { |
| 256 | const char *errstr; |
| 257 | char *val, *msg; |
| 258 | int rslt, token; |
| 259 | long long numval; |
| 260 | |
| 261 | token = next_token(&val, cfile); |
| 262 | |
| 263 | numval = strtonum(val, low, high, &errstr); |
| 264 | if (errstr == NULL((void *)0)) { |
| 265 | *number = numval; |
| 266 | return 1; |
| 267 | } |
| 268 | |
| 269 | rslt = asprintf(&msg, "expecting integer between %lld and %lld", low, |
| 270 | high); |
| 271 | if (rslt != -1) { |
| 272 | parse_warn(msg); |
| 273 | free(msg); |
| 274 | } |
| 275 | |
| 276 | if (token != ';') |
| 277 | skip_to_semi(cfile); |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | void |
| 283 | parse_warn(char *msg) |
| 284 | { |
| 285 | static char spaces[81]; |
| 286 | unsigned int i; |
| 287 | |
| 288 | log_warnx("%s: %s line %d: %s", log_procname, tlname, lexline, msg); |
| 289 | log_warnx("%s: %s", log_procname, token_line); |
| 290 | if ((unsigned int)lexchar < sizeof(spaces)) { |
| 291 | memset(spaces, 0, sizeof(spaces)); |
| 292 | for (i = 0; (int)i < lexchar - 1; i++) { |
| 293 | if (token_line[i] == '\t') |
| 294 | spaces[i] = '\t'; |
| 295 | else |
| 296 | spaces[i] = ' '; |
| 297 | } |
| 298 | log_warnx("%s: %s^", log_procname, spaces); |
| 299 | } |
| 300 | } |